10．Which of the following best expressed the main idea of the last paragraph?

　　A．Doctor’s concerns remain unchanged.

　　B．Medicine comes from nature.

　　C．Environment affects health.

　　D．Climate determines lifestyle.

　　Ⅴ.阅读填空

　　(2017·岳阳一中高三月考)Every person needs energy to go about the day and continue to function correctly.To get this energy，you eat，and your body changes the food into the nutrients and energy you need to survive.Your metabolism (新陈代谢) is directly related to how quickly and efficiently your body creates this energy，and if it takes too long，the food gets stored as fat.A slow metabolism will leave you with less energy and more weight than you probably desire.

　　Your basal metabolic rate (基础代谢率) is the amount of energy your body consumes while you’re resting.When people say they have a slow metabolism，they mean they have a slow basal metabolic rate.Increasing this number is possible through exercise and muscle building.

　　According to Metabolism－Advice.com，as your age，your basal metabolic rate will lower as your body begins to deteriorate (衰退)．At the age of 30，your body will stop producing the high levels of growth hormone it previously produces.Your body senses that it’s done growing at 30，so it uses the resources elsewhere.Unfortunately，that means that your muscle will deteriorate more rapidly than before.While you can’t block age’s effects or your metabolism，you can fight against it with regular exercise that builds muscle.

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